Did a big loop this weekend - Fort Collins to Saratoga, WY then south over Cameron Pass and down the Poudre Canyon. Changing leaves seem to be running late by a week or more. Also, the colors generally didn't seem to be as vibrant as usual.
Some areas only 30 - 50% (Centennial, Snowy Range & west slopes of the Medicine Bow range in Colorado), others at 50% or better (east slopes Sierra Madre in Wyoming and the Park Range in Colo). Upper Poudre seemed to be close to peak in most areas. Best color we saw was south of Saratoga in places and approaching Gould. Cottonwoods and Willows along the North Platte from Saratoga south are completely unchanged.
Next weekend could be prime time for color in Northern Colorado and Southern Wyoming.

Was up in RMNP around Bear Lake this weekend. Colors up there are near or past peak around Bear Lake with some great oranges, reds, and golds. Bierdstadt Moraine was about 75% changed and will peak this week if the wind doesn't knock all the leaves off the trees. Lots of wind this past weekend(26-27th) causing the leaves to fall fast.
Photo album from the trip
http://www.ericjlee.com/Photo/thumbnails.php?album=215

A lot of leaves have been dropping the Vail/Beaver Creek area the last couple of days on the higher ridges, probably a lot of that is from the wind. This might be the last good weekend for us before its too far past peak on the hills. The valleys are still turning over though!

Went to the Lake Blanche on Thursday. The trail was snow covered and the Aspen Trees at the lake were just starting to turn. The bushes along the trail were on fire. Went to the Great Western on Friday (from Gardsmons Pass to Mill D North) and the colors were better at Lake Blanche. There was an occasional Aspen that was golden but most of them were still green, brown or already dead.